Hello hope this will do the trick for youTo reset waste tank full error in MP730.1. Hit the "menu": Key2. Hit "Copy" Key3. Hit "#" Key4. Scroll thru the menu headings until you come to "Test Mode" - 12th heading5. Hit the "3" button- this will bring up Eprom Clear6. Hit "0" button7. Hit the "Stop" buttonCan only try then your printer go on longer but some time the other you need to clean out the waste ink it inside the printer go to open up all.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

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The waste bin full error can occur if the waste bin was not removed
from the machine for over 10 seconds when it was emptied. Please remove
the waste bin and wait for a full 10 to 20 seconds before replacing the
Waste bin.

If the message still displays turn off the machine and leave it off
for 1 minute then turn the machine back on.

Hi and welcome to FixYa!
If the waste ink pad is nearly full you will need to have it replaced or reset the purge counter to get rid of the message. Please be informed that even the message is resetted theres a tendency that the inkpad will overflow and you may find spill at the bottom of the printer.

Thanks for using FixYa. Open the cover, move the cartridges to the centre, and then press the pad of absorbent paper towel onto the waste ink pads. You can locate the waste ink pads to the right of the cartridges. This will absorb a lot of ink in the pads and that will remove the warning after you reset the printer waste ink tank counter. To reset your Printer please tell me the model number of your Unit so that I can provide you with model specific information.Please do rate the solution and revert for further assistance.ThanksRylee

You can try to read these articles on how to reset the waste ink full error on canon printer.
http://www.fastrepairguide.com/waste-ink-full-error/how-to-repair-canon-ip1000-waste-ink-full.html
http://www.fastrepairguide.com/waste-ink-full-error/canon-waste-ink-full-error.html
They even provide the service tool program for reset the printer eeprom data(set as factory default).

Try the following procedure:
1)Turn off the printer. Press and hold the Resume/Cancel and Power buttons at the same time.
2)Release the Resume/Cancel button. (continue to hold down the power button)
3)While continuing to hold down the power button press the Resume/Cancel button 3 times then release both buttons.
4)The LED should now be green. Press the Resume/Cancel button 4 times. The led should be green.
Power it off and back on and you should be good to go!
Please update the question & let us know if the information given was useful to you - Good Luck!